arg_parse.c

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/*
 * Copyright (c) 2009 Lukas Mejdrech
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <arg_parse.h>
#include <errno.h>
#include <str.h>

int arg_parse_short_long(const char *arg, const char *ashort, const char *along)
{
        if (str_cmp(arg, ashort) == 0)
                return 0;
        
        if (str_lcmp(arg, along, str_length(along)) == 0)
                return str_length(along);
        
        return -1;
}

int arg_parse_int(int argc, char *argv[], int *index, int *value,
    int offset)
{
        char *rest;
        
        if (offset)
                *value = strtol(argv[*index] + offset, &rest, 10);
        else if ((*index) + 1 < argc) {
                (*index)++;
                *value = strtol(argv[*index], &rest, 10);
        } else
                return ENOENT;
        
        if ((rest) && (*rest))
                return EINVAL;
        
        return EOK;
}

int arg_parse_name_int(int argc, char *argv[], int *index, int *value,
    int offset, arg_parser parser)
{
        char *arg;
        
        int ret = arg_parse_string(argc, argv, index, &arg, offset);
        if (ret != EOK)
                return ret;
        
        return parser(arg, value);
}

int arg_parse_string(int argc, char **argv, int *index, char **value,
    int offset)
{
        if (offset)
                *value = argv[*index] + offset;
        else if ((*index) + 1 < argc) {
                (*index)++;
                *value = argv[*index];
        } else
                return ENOENT;
        
        return EOK;
}

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